You can do this with my Kobo Utilities plugin. There is metadata update function that can set the date added on the device to any of the dates in your library. You have to do this after sending the books and letting the device import them. Connect again, select the books to be changed, and run the choose update metadata on device function from the menu and select the desired options. It will update any where the metadata in the library does not match that in the device database for the selected options.
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